Rename .hero-unit to .jumbotron becaue fuck dashes in filenames and sports metaphors are cooler than ad ones

* Deprecate .input-append and .input-prepend
* Use new, single base class for component, .input-group
* Deprecate .addon for .input-group-addon
* For compatibility with all buttons, require .input-group-btn to wrap buttons and button dropdowns
* Still need to reimplement with segmented button dropdowns, but that's dependent on a refactor of those first

* Scopes striping to immediate children of the tbody and tr
* For nested tables, sets a background color of @bodyBackground, to override the default transparent bg

* Add simple test to css-tests.html
* Scope .table-bordered to immediate children th/td elements only

* Don't reset width on .container, .navbar-* .container, etc
* Instead, use max-width to ensure proper styling for all navbars

* Includes text inputs, selects, and textareas
* Updated docs to include .span* sizes wherever possible
* Commented out responsive 1200px inputs grid
* Still some derp to be done to improve more, but this is a decent first stab

Fixes #5594: Vertical button groups show use max-width, not width, and be scoped to immediate children buttons only